Evidence of Three Subspecies in Trifolium nigrescens Viv.

Williams, W. M.; Ansari, H. A.; Ellison, Nicholas W.; Hussain, S. W.

doi:10.1006/anbo.2001.1399

Cited by 31 publications

(37 citation statements)

References 9 publications

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“…No experimental results were presented by Nutman (1959Nutman ( , 1965 to support his groupings. These groupings follow the phylogenetic relationship of the species as this is close between T. nigrescens and T. repens (Williams et al 2001), with a considerable distance to T. subterraneum (Zohary & Heller 1984). Abberton et al (1999) found that although a mixture of five strains of rhizobia known to be symbiotically effective on T. repens formed nodules on all 24 T. nigrescens plants, only four plants exhibited symbiotic N-fixation.…”

Section: Introductionmentioning

confidence: 55%

“…This result is consistent with the inclusion of T. nigrescens in the same symbiotic grouping as T. subterraneum (Nutman 1959) rather than the T. repens grouping (Burton 1985). This is surprising given the close phylogenetic relationship between T. nigrescens and T. repens (Williams et al 2001). T. subterraneum on the other hand is classified taxonomically at a considerable distance from T. nigrescens and T. repens (Zohary & Heller 1984).…”

Section: Methodsmentioning

confidence: 99%

“…meneghinianum-on the basis of hybridisation experiments, rDNA internally transcribed spacer region sequences, and different chromosomal locations of two ribosomal DNA sequences. These traits differ markedly among the T. nigrescens subspecies and all three differ from T. repens (Williams et al 2001). Ertekin & Akbayin (2000) described a new variety, T. nigrescens ssp.…”

Section: Introductionmentioning

confidence: 98%

“…petrisavii. Williams et al (2001) have proposed dividing T. nigrescens into three subspecies-ssp. nigrescens, ssp.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, symbiotic relationships of the three subspecies proposed by Williams et al (2001) were investigated.…”

Section: Introductionmentioning

confidence: 99%

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Symbiotic relationship betweenRhizobium leguminosarumbiovartrifoliiand Trifolium nigrescens

Pryor

Lowther

2002

New Zealand Journal of Agricultural Research

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Recommended strains of rhizobia for Trifolium repens and T. subterraneum, and rhizobia isolated from T. angustifolium and T. pratense root nodules, were used to inoculate seven accessions of T. nigrescens and their own macrosymbiont host plants growing in N-free media. When inoculated with the strain of rhizobia recommended for T. subterraneum, foliage weights of six of the seven T. nigrescens accessions were either the highest, or not significantly less than the highest. This supports the inclusion of T. nigrescens in the T. subterraneum group when grouping species which respond similarly symbiotically. The response of foliage weights of T. subterraneum and T. repens plants to inoculation with the strain of rhizobia isolated from T. angustifolium was similar to that following inoculation with the recommended strain for T. repens, rather than with the recommended strain for T. subterraneum. This result indicates that T. angustifolium should be included in the T. repens group when grouping species which respond similarly in symbiosis.

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Section: Introductionmentioning

confidence: 55%

Section: Methodsmentioning

confidence: 99%